NOTE Newtons laws does NOT seem to work here

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Discussion Overview

The discussion revolves around the applicability of Newton's first law of motion in a specific scenario involving an object in motion, as well as the influence of the Moon's gravity on tides and space walkers. Participants explore the nuances of motion, gravity, and the effects of different forces in various contexts.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • Wayne asserts that Newton's first law does not apply because the object does not maintain constant speed and appears to stop.
  • Some participants, including Torquil, argue that the object does not stop and is affected by gravitational forces, particularly in the context of a space station's orbit.
  • Wayne questions why the Moon can influence tides, which involve massive water bodies, but seemingly has less effect on lighter objects like space walkers.
  • Torquil explains that the Moon's gravitational influence is uniform across objects but manifests differently due to the rigidity of land versus the fluidity of water.
  • Participants discuss the proportionality of gravitational force to mass, noting that larger masses experience a greater gravitational pull.
  • Wayne acknowledges the explanation regarding gravitational force and its effects on different objects.

Areas of Agreement / Disagreement

Participants express differing views on the application of Newton's first law and the influence of the Moon's gravity, indicating that multiple competing perspectives remain without consensus.

Contextual Notes

The discussion includes assumptions about gravitational effects and the conditions under which Newton's laws apply, which are not fully resolved. The nuances of gravitational influence on different types of matter are also explored but not definitively concluded.

Who May Find This Useful

This discussion may be of interest to those exploring concepts in physics related to motion, gravity, and the effects of celestial bodies on terrestrial phenomena.

waynexk8
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NOTE Newtons first law does NOT seem to work here, at the object does NOT keep moving at a constant speed, it actually stops.



Am I missing somthing ?

Wayne
 
Last edited by a moderator:
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waynexk8 said:
NOTE Newtons first law does NOT seem to work here, at the object does NOT keep moving at a constant speed, it actually stops.



Am I missing somthing ?

Wayne


It don't seem to stop when I watch it.
EDIT: Darn, beaten.
 
Last edited by a moderator:
waynexk8 said:
NOTE Newtons first law does NOT seem to work here, at the object does NOT keep moving at a constant speed, it actually stops.
What exactly are you talking about?
 
waynexk8 said:
NOTE Newtons first law does NOT seem to work here, at the object does NOT keep moving at a constant speed, it actually stops.



Am I missing somthing ?

Wayne


Yes you are missing gravity. If I'm sitting on the space station and push some object towards earth, it will come back up again later on. If the space station has a circular orbit, the thrown object will have an elliptic orbit. Sometimes closer to earth, sometimes farther away. So it will move up and down relatively to me.

Torquil
 
Last edited by a moderator:
Looking at it again, I suppose there is not enough evidence in the video. But it looks like to me that its either slowing down or stopped and just rotating, or even going if anything in another direction.

Wayne
 
torquil said:
Yes you are missing gravity. If I'm sitting on the space station and push some object towards earth, it will come back up again later on. If the space station has a circular orbit, the thrown object will have an elliptic orbit. Sometimes closer to earth, sometimes farther away. So it will move up and down relatively to me.

Torquil

K thx.

Ok, if the Moon can move the tides, and they must weigh Billions of tones, why does it not move far lighter things on this Earth and things like space walkers ?

Wayne
 
waynexk8 said:
K thx.

Ok, if the Moon can move the tides, and they must weigh Billions of tones, why does it not move far lighter things on this Earth and things like space walkers ?

Wayne

The moon does influence the movement of space walkers.

Also, its gravitational field acts on every object on Earth the same. The difference between its influence on land and water is that land is rigid and water is not. The water is able to flow, and therefore the effect of the lunar influence is different.

EDIT: I'm not saying that the strength of the gravity from the moon is the same all over the earth, of course. See post #9 for the explanation of the tides.

Remember, the gravitational force between two objects is proportional to the product of the two masses, so the force acting on the billion of tonnes of water is proportionally larger.

Torquil
 
The moon affects the tides by an uneven pull between the areas of the Earth closer to the moon and the areas of the Earth farther from the moon. An astronaut, being small, does not feel this difference in pull appreciably; he feels more or less the same force throughout his entire body.
 
  • #10
torquil said:
The moon does influence the movement of space walkers.

Also, its gravitational field acts on every object on Earth the same. The difference between its influence on land and water is that land is rigid and water is not. The water is able to flow, and therefore the effect of the lunar influence is different.

Remember, the gravitational force between two objects is proportional to the product of the two masses, so the force acting on the billion of tonnes of water is proportionally larger.

Torquil

Ahh,the gravitational force between two objects is proportional to the product of the two masses.

Great get it.

Wayne
 
  • #11
Matterwave said:
The moon affects the tides by an uneven pull between the areas of the Earth closer to the moon and the areas of the Earth farther from the moon. An astronaut, being small, does not feel this difference in pull appreciably; he feels more or less the same force throughout his entire body.

K thx.

And thanks to all.

Wayne
 

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